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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea37f46bb6f0a1ddad82e7fccd1e41258c5dbe0c5b98ebb4910e0b7fdf00113c' 
  AND token = 'DTnnQ7VLGetKSt30hC9eGf04ciCXXYW9nxTnKMo3Hqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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