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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27cf3538147efe103b73a779d67701ee9b2d8cff53467e85e876f60a48cb58e' 
  AND token = 'QKo56FCHNwn7CVDg/5oYbNGaco/x4BlnWKJ6VCOMVwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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