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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bb8c08fa8e209d966b0fc62cfe82fa3e03903d12d0a2d9d5a52ebe97cf33d8' 
  AND token = 'tgXws9/J3dgf6yBI5wPgFHO+U8uEZ8rIF9J5Em5DQ0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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