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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0551dac5f139e68c567f3599cec2190e4994de53b7e5f9a61ec578a88ad3f69' 
  AND token = '0AKbcpGoYklDi5GeBR7M4AnVXvdXfeLCr10dq5SDNPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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