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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b1e86a9d9a93561ef22e4f4d6fec982570799e076108331d1a30bf202e2372' 
  AND token = 'hkoccmn5hGawouAKzmoaJc9ryn+24st2Z4tGkv8+Wgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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