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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5ba47c7a81c207089cf93914b4303d20a6bcf86d0d3b554c2f082fc84166c6' 
  AND token = 'WZjH/RksENkTn9311KZxT8tnbGXvOB17E7qPHtWzLb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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