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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aeb9f3a7cfb078dc5ebdf4f1daebcdde57de87e71ad277d64556d67670e9d16' 
  AND token = '3C4bcTvBHAoXmMSMIMXRsyoTV8H8PKVlfAZdTUHbNCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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