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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd27368f039bdf06ffd639780e009b5fc354d2be93eeef41a44cce96a222d6df' 
  AND token = 'ddJK6LeBvKpaNdvASpAkuGBCUtdn2XeY6MHtWLkNfzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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