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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f94167c804cf5fbf491fb69c84f84b2f7768931f5d7003a35163ff77be9af9' 
  AND token = '1P6+z28a845/UT1chF2inyeG6bH6/f7PcH4SDGTFWlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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