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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec67f13ef49123bff34661b53842774116750f2a7190c56f1ea7b8f3bfc8096' 
  AND token = 'rgaqRyt8GXFZYwoxR27v88f3e6t1U7+m/9tprz50Vks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}