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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa056ff41dc39d2829d2334d4c9873cdf9eb3acdbb4722647d6a07d10936942' 
  AND token = 'tmKZLsea2FwTeT8MTogMF2JEELZ4+44+MB0X0bSdZXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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