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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc3712d4a73c3104af1dc35e078aaeb8fc5e66a0c0905bdf921c40e7dad4700' 
  AND token = 'WnGPdbzN9goFrX14y+j0TPEUQEwssratw6p9Seg4aeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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