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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fc2151250f596dd20410d120875d34504f03c1e4e6e662f08dbbacd7ad7a7b' 
  AND token = '6enmxOC1jNE4pNWRq+8kunShvZ3dDTpsIP1WO8G2Qvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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