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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d594d4ac245a4a4297be86e855d0ed1c970209b506913878fab3c87087f95f2' 
  AND token = 'kIh7Tbzvp75QOi+TsfWVYBY6l/0w7DOdZc/r3m3mUF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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