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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f6c37c4325eb32a0c30ae75a1f8c3bbb812ba39a50ee2e8188b01404d2468f' 
  AND token = 'eeo9caEPKSSydGGGwbfgoR6WLHuTQgL6W8a5Blz4suQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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