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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d32a2f4802d36b814ec9cc6a310f8fc8297c558cea6005e0cfe427a73381d3' 
  AND token = 'CG4HhZGP22prp/g3nwBjE7HieR1fwfTNrJb+I3Fu9oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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