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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1379da2ced8021d46b069664f6193e20f332e7ee7a4126ffd6809d3f784f89' 
  AND token = 'kevmyGA8E/uU16QK31K97CsZ4cpy8o2x+cFUxdHX3KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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