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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c9bd44f7a8ae21bab592a2a6cdac0e4e78cc3a19b60bb5000fb5d59bc260ac' 
  AND token = 'fY2kqhphtwClZFZxYNBZQSUuoGQ+7iEvBw2FieNvmO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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