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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb10a276569c2f6d0897a213dab5c5457800f9b4cdc3a0065171fc01e48df199' 
  AND token = 'R18YxpsRKR324Ka97RnV9++mSVQFZuFKl+1eovLNpTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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