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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d43e1e1ebb4f02b3dee51d70a2081567810341c22bace6baf62a93fb0c7eef' 
  AND token = 'mNyVJUy1S/f72vR15aMZn2nv/4eCP01GeU7/FZRI7kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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