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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3fe6420fced60c681edfe732eeee53df75067b369162c0d67ac961f2400320' 
  AND token = 'z8uqSti2MFK0e+dYHm1tOck/fpDnYwhn9rdJ8KbkKBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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