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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dace1c220dab07892ea9d7e5cb320007790b59e6e0bf2db071f853ccfc38c5' 
  AND token = 'K2jjMA5+1DT7s5eF5e4O3n0E1K2boMYK/Jfz6Wl/uic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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