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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262aa2c765907e2311a4241ce7bfbd6bd1103720a4dc417448b4a557215f1bdc' 
  AND token = 'o1TVxafiyJ10whDRyi8T5mQ2GZlT9fJcrg8hbhyysgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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