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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0fb415b0e48f6cc194bd82d56536f710efceecceaa35cb4a265ed5d5730b76' 
  AND token = 'Nq/lRhFquFDbzbk7f5rdu8alsrJcuJ6/nKXpjHSZJmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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