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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e55ce956b3b015b67155b26d899c9e696f1935e74ba103465e6ffd1aa29f88' 
  AND token = 'mf+iezrH/eaLDSRkka5mRbvrvED+UKALCetKVsxsKbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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