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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b32d4112fa575d331e8270f5894455b4f6532c0022120cf98c3b9bdec2bb13' 
  AND token = 'lQxtHvTx8R/+SbYrKGavykue8lIyt9tsI92kDwl3zC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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