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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1bf998c037aabe49bd3b6a73d3a160d6829547a925308960ee156ee7289d66' 
  AND token = 'If8YPCuR03+baMLndjeVJa1blaeQGRu1nV+0oYvV/Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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