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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bd023631420363e190b64d82c07396475f387405f93248d38535bdf4e17d8e' 
  AND token = 'LGSj/JB8Ch/z6j/Ykn8/Xsyj4o/R4ENB5LERM6Ac0XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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