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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e78465234d848e0de8f879ddccdcdf39e6c7e14bca176beabd0e0a624b10bb' 
  AND token = 'iOqsVlpeb0boHCg4CxF0IZjUQuBME8c8nF6I39Bzdl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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