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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd354e0dbf0ecb9b5fe51d610b93c75d50cf84de1fa5bb7f5016ed65a97c98566' 
  AND token = 'TGEBvcdwLBnMkanX0geraKpmc59TzXY7RVsRapsr9jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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