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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d112a4f56ab7572ebdc97f5f1c3c3a232428dda581e7372e715d35db066f6d' 
  AND token = 'e/eQJm4x4NYkz9hUXjq/g4GsGOM1NFPD6PC7U5ObktQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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