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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ccca04ee16417574a1211366a8131b77264de5437425e95f38195f34048995' 
  AND token = 'Mchn0jsuTs0VxDZmDD2w7fe8vtTULk8Uq8Lr+DaqANI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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