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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba170b65f295e3faedd3c399cf7621885def984d26bd27df48695b55963cf09e' 
  AND token = '2bMfbMfVMzLG+hKFUMPNMpzQiCqGLnvcnaeAzx0Kj7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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