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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7d1b060a4d8f8f32cea08cecdcd64f94f0988ecb4abf300f3ff34d97c0b615' 
  AND token = 'dKqWffw7BXJxhukphppimm1cBYkTMdrZMczRbbw8H7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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