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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f830ae3c3b5824c6230ce63929934fef62dc436bb7d4312e7926c7b985a71c02' 
  AND token = 'FmgrW24ui2XnrdrQ3spqs6JXNaY7QQLaSkj12lqF+lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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