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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59561c6ba023eab8be5471f5e1dccbc5fa036f10401c2a93173249b72e26e213' 
  AND token = 'q7ABKXClZswZUYaCxJEALsFSCuZLf4FtB1nfySClzrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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