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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b28b90661862a34e165784e66c591fe6fcbabc8771b7f49e5da18c4f201000' 
  AND token = 'XMH0BMBqRp0nvxs2Pyes4ZDkQKIP30W7KVoyfbaCAHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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