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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41677c23e9e9695d1f965b6b48f322b093904014c5afbe122ec39f624e0b74d3' 
  AND token = 'GkngVTR1xTUr9oane274zbwyWcfbmpto2csSW6/NsEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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