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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369deffd242f772a2d90fac08e1dfee20da25760f685f5b338ba3b94e75a6ebb' 
  AND token = 'STM4VHw3ZkEGDtJtx3XkSNqIyooPXasS2mrlhOJnF5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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