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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87c8d532e658138aeba3d95f949502f8d327b1e6f5f4a38225aeeb35812a263' 
  AND token = 'ahm8wrLWtnRmR+cyG3aOdrjQtSrXj17fEGa8oUPPffg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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