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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e5e3e92579f052b7e72a3c372fd1ef4fceed262a912b81bb7679d64e42c30f' 
  AND token = 'iALVBcpfPtRXaty8ldGDyDlyengqR+j9o3O3Pq07oCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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