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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b573fc6c879b8248aebc6fbd6b08f9acc75408f0c060f090a00ccf56ee5bc2bc' 
  AND token = 'M8xtfCTBmbEIOnnoKgS7QLXZ9t9dw1/PPxdaW/Hq6dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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