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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f1b909f4936394054e4c1d9460e5e848402faefa252062ad9b913e4a3cf01a' 
  AND token = 'apSnHNM5OiiDE+i6314RoTfpgj/ObVKEls7CyVf2Kow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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