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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0456bf979d2195613d60d0564d2db928cb99b44f655fc7595bf4b7d0a1adc370' 
  AND token = '0tUA0uAOodMKc0ZfkohZ7U46iuX70gZpcMXnOU5c1Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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