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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0076a801f3c1f4db6ab221bb5cd702805896597a0c3a997781ba339c3eeca26c' 
  AND token = '5pBrV6TD1lcolUceJtrvLciwQ4+JXiC6qVxSQ/nBsc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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