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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133e30d1e26a236fe634397fd6700914a89c67fa6d0b0f5af0f089e74970c5fe' 
  AND token = '03js7+i5Q+hGdqtxeD3VUM079dS0SubfM4D1g1OBsLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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