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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a74cae00618c810e6f9c24f0c04bb989a1c24e4f820778adbdfb824177f31f8' 
  AND token = 'rvFombByIZ96tLaY0WK6Iff6SR4EBEDLQKM3fQjYSWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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