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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31fbc5ec0c085de793ae18b4b766ec55398596b95a82b5eaeadbb440074a5831' 
  AND token = '4e2bAujt9i+ZRtV6jF7aBolN8Hia6CZFaGymnRsffWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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