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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a52b5c4ac4d3243336d32e860dedcbc15fd4a353e244fd63c9c2d4b9f87f24' 
  AND token = 'VDb6h57qkgN6rUNM9Xu68yZ8oovF9Jkk3i4X2pJCueE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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