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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ceb2d3f34498bf5fe9b6d972b1aa160b723fa388246662f05d08eb7c83a138' 
  AND token = 'n/RO5yL2pAouM+tcCuFoP5E5oFs3si56ec11TiXdnTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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