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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c03c44ce6ff8f5ef077d154527e0cb6a81df807a4de222360b82aef75a790d' 
  AND token = 'SgXr8sLzDjC3LpHF1zFw0UMyUd+Q3vQp9shdHIIcOyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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