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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e73c26187427c44b84a61f3fe33d0ead70e1e716315114195e90c2299e780ec' 
  AND token = '2cGH18WrB04c5wQEfyJsHoD7Vr5GFdLBEUTQQK9ykcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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