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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9352e6fdfab6f3df604d999900a6cae3039da52dc4c2bfdf3450eb4d3acd04f6' 
  AND token = 'pedP2XCK3/Njx+70CDB40C8ud9h3I/cZsVtMX6sERaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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