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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52eac4d75f373da7cc43c248e582929ee54cbfa217fc3b1e48c7715379680864' 
  AND token = 'jESDg5msY9QakzvP9+zHFV5NEewQf3jfDyYQ3je2cVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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