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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b42f3f43b8ccce039af96be1e8a4ed68c69deea4cced814d0a0f774cad8d13' 
  AND token = 'Non+tE2ZfqpeKAKn+nwz4Lb2PPE/Vg+XpLU8kBBwWHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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