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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b782773a530340e368a93c19061fc705fa3f2172c1cb2f994079915710ea58' 
  AND token = '+107XfCgDRF664VWYd07pC6WBI60u/NexjtKdT8DXCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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