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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388236529c4e03df963b9fb4a7cfd9e2f80dcbd2d97d5088e8bc116e922ede52' 
  AND token = 'Q7CIRxrsXMMm5er7Oa0Z+lCq37qQRax22SYv5GhKhCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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