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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7438b3e6bb0e739a712011f0169900264242c6face75a165669627faf9f749' 
  AND token = 'bNbhkMbyhgSYeoeb8RHzuGE3Hm9JhCHZtY5UeAkzpzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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