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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fff40bdb9cefcb19b3bdbde55ca4a77b0bc382ff47ae806f3b2cfe237b6a70' 
  AND token = 'ETsKMv9CDsYwvG3d0VFhXUyqEVoIOFoJZvXTBevGKIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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