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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fa8a6bfaadf507eea54da2d030369361035b247d7d8f46e0eb4b0ccf3bdf97' 
  AND token = 'Oj+JI5knzA/z72Uhkdx9p6/9V8bBO9/asenNWjxTTG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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