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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73719191f01883b576a0049eebc111d50c3507bd090b5ab2dd1f4eff468cbd65' 
  AND token = '0i4L7U9TvFmXE81lCodQG2/YFcdMw80ml4H5GVfgxYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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