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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2ed956ba3b5f7415b51a076e0f0a6a18ad8a9422722d1d627f9682cbe8270c' 
  AND token = 'GUULxPmlJ5ZpUlZRSxr4jvs9aimDEz6UqxquLbsBW8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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