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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a8cd28a183eb2d27a85250fd644403ed23154604c095d03e68784e5a8a97ee' 
  AND token = 'bTLyRdRZRY0ubNoDcccxn6LvoYQNCz+GAvd6nuZCZTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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