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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afab54498b737880a8ef18772c8779da4fd15cece634b307e99ffc995094b75' 
  AND token = 'btLo9mX+7ax/G9zr54jkeAWlnjz9wMf5/F/5e6tfDxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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