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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2730edfeb39f7ab10087143757392ccd182f251b1ab40525deb6bc37e27fbc9c' 
  AND token = 'e1TMEz3H36mrJ6e2IyMSXMPqylC3INhY40Ej41sMO+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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