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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a92a6c34b938235198ce45d4c79defc7d41e0ba8beb06c584bc8f4b9ee06c8' 
  AND token = 'Zw1c0P52LOlLrB3kk7L51GBe+c+H4ri98XCpCCOxTu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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