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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0510f8884ecc3a85c44c980dd42d7a46b3e22021d74645d68b6ba3adef4e997' 
  AND token = 'VgCqk8sHty4jcKdyMkdJ9I77he6o/mBH5z13jEuppKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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