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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5941e55d45792e3aceb1f9f5ca62af187eedef9bf43b5e18179fb04e3f9407b0' 
  AND token = 'Gm67cElDmf82FUleC6px7VCSArG7s1sI7SGHDUPPrVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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